On Wednesday, 24 August 2016 15:01:23 CEST Richard W.M. Jones wrote:
> Libvirt >= 2.1.0 now allows you to open files which have a "json:"
> QEMU pseudo-URL as backingfile, whereas previously it would fail hard
> in this case (RHBZ#1134878).
> 
> When virt-v2v performs conversions from Xen (over SSH) or vCenter
> (over HTTPS) it uses these pseudo-URLs as backingfiles.  We had to
> tell people to use LIBGUESTFS_BACKEND=direct to avoid libvirt in this
> situation.
> 
> This commit narrows the check so it will now only print the error if
> libvirt < 2.1.0 and LIBGUESTFS_BACKEND=direct is not set.  Also the
> error is modified to tell users they can either upgrade libvirt or set
> LIBGUESTFS_BACKEND=direct to work around the problem.
> 
> Note there is not an easy way apart from checking the version number
> of libvirt to tell if the json pseudo-URL is supported.
> 
> As a side-effect, this commit also prints the libvirt version number
> in debugging output when virt-v2v starts up, which is sometimes useful
> information for narrowing down bugs (it is in fact already printed by
> libguestfs, so this is duplicate information, but it's a bit easier to
> find when it's at the top of the debug).
> 
> Thanks: Peter Krempa.
> ---

LGTM.

Thanks,
-- 
Pino Toscano

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